2010 civic headlight relay location?

Trying to idiot proof 2010 civic, so headlight will be on ONLY when engine running....no more accidently leaving lights on and drain the motorcycle sized skinny battery in 1 hour!
Normally this can be done by connecting the coil of headlight relay to IGNITION 12 V instead of CONSTANT (Battery) 12 V....done it on a Hyundai Elantra.
Unfortunately, I can not even find headlight relay .....it is none of the relays in the engine comparment fusebox.
Must be inside the cabin, underneath some hard-to-reach non-accessible place !
Any suggestion ?
Thanks!